Pipe-curving machine.



PATENTBD OCT. 1, 1907.

W. 0. KIRK.

PIPE GURVING MACHINE. I APPLICATION FILED JULY13, 1907.

8 SHEETS-SHEET 1.

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Ingentor U). LY/1 [n1 Attbrney Witngss'es Ga PATBNTED OCT. 1, 1907.

1%., 867,380. W. 0. KIRK.

PIPE OURVING MACHINE.

APPLICATION FILED JULY 13, 1907.

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' W. 0. KIRK.

PIPE GURVING MACHINE.

APPLICATION FILED JULY 13, 1907.

8 SHBETSSHEET 3.

. Inventor by Uu. S 92,

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,datorney UNITED STATES WILLIAM CLARK KIRK, OF OHATTANOOGA, TENNESSEE.

PIPE-CURVING MACHINE.

Specification of Letters Patent.

Patented. Oct. 1, 1907.

Application filed July 13, 1907. Serial No. 383,555.

To all whom it may concern:

Be it known that 1, WILLIAM CLARK KIRK, a citizen of the United States,residing at Chattanooga, Hamilton county, Tennessee, have inventedcertain new and useful Improvements in PipeCurving Machines, of whichthe following is a specification.

This invention concerns itself with an. improved machine for curvingsheet metal pipes by forming a series of substantially circumferentialcrimps or corrugations in the pipe, the corrugations being deeper at theconcave side of the curved pipe. While the principle of my machine lendsitself to more extended application the exemplifying machine herewithset forth has been devised for the special purpose of producing stovepipe elbows curved by means of a single continuous helical corrugation,as illustrated in my U. S. Patent No. 850586 of April 16th, 1907. In theexemplifying machine herein set forth the unseamed straight tube ofproper length is placed in the machine and the machine started,whereupon the corrugating and consequent curving is done by continuousaction of the machine which automatically stops upon the completion ofthe work.

My invention will be readily understood from the following descriptiontaken in connection with the accompanying drawings in which 1 Figure 1is a front elevation of a pipe curving machine embodying anexemplification of my present invention: Fig. 2 a plan of the mainfunctional parts of the machine, part section in the plane of line a ofFigs. 1, 3 and 4. Fig. 3 an elevation of the head of the machine: Fig. 4a vertical section in the plane of line 0 of Fig. 1: Fig. 5 a plan ofthe swinging chuck carrier: Fig. 6 a front elevation of the feedmechanism forthe sliding chuck: Fig. 7 a plan of the trigger forautomatically arresting the motion of the machine: Fig. 8 a verticalsection of the stop clutch in the plane of line 6 of Figs. 3, 9 and 10:Fig. 9 an elevation of the front face of the stop-clutch, the drivingshaft appearing in vertical section in the plane of line f of Figs. 1and 8: and Fig. 10 a vertical section of the stop-clutch in the plane ofline g of Fig. 8.

The machine particularly set forth herein being designed for theproduction of stove pipe elbows, let it be assumed that there is in handa straight metal tube of proper diameterand length, with the joint-edgeslapping but not seamed, the duty of the machine being,

beginning at a point near one end of the tube, to form In the drawings:1, indicates the bed of the machine: 2, a transverse guideway at thehead end of the bed: 3, a headstock mounted in this guideway and capableof "some degree of movement therein transverse to the length of the bed:4, a longitudinal guideway in the bed at right angles to transverseguideway 2: 5, a tailstock sliding in this longitudinal guideway to andfrom the headstock: 6, a fixed chuck-ring rigidly secured to thetail-stock, this chuck-ring having a cylindrical bore of a size to suitthe tube to be dealt with, the axis of the bore of the ring beingcoincident with the axis of the headstock when the latter is in acertain position of transverse adjustment: 7, an expansible skeletonplug disposed within the chuck-ring and adapted, when expanded, to clampthe end of the given tube concentrically and firmly within thechuck-ring: 8, ,a conical spreader disposed axially within the plug andadapted, by endwise adjustment, to expand the plug: 9, a hand-Wheelthreaded upon the shank of the spreader and adapted to draw it forciblywithin the skeleton plug to expand the latter: 10, the main bearingformed by the headstock 3, the diameter of this bearing being very muchin excess of that of the largest tube the machine is to deal with: 11, alarge open driving ring journaled in this headstock bearing: 12, gearteeth formed on the periphery of the driving ring: 13, a driving shaftjournaled longitudinally in the bed: 14, a pinion on the head end of thedriving shaft and engaging the teeth on the driving ring: 15,-a gearloose on the tail end of the driving shaft: 16, a countershaft journaledin the bed and adapted to have rotary motion transmitted to it from anyproper extraneous source of power: 17, a pinion fast on the countershaftand engaging gear 15: 18, a stop-clutch, considered as a whole, forlocking gear 15 to the driving shaft when the machine is to operate andfor unlocking it when the machine is to come to rest: 19, a stop screwcarried by the bed for limiting the transverse adjustment of theheadstock in its guideway in one direction: 20, a similar stop-screw forlimiting the adjustment of the headstock in the opposite direction: 21,a lever cooperating with the bed and headstock and serving, when placedin the vertical position indicated in Fig. 3 to throw the headstockagainst stop screw 19 and serving when turned down horizontally to drawthe headstock against stop-screwZO and lock it in that position, inwhich position the axis of drivingring 11 is eccentric with the axis ofchuck 6: 22, a carriage sliding in a guideway at the head end of the bedin a direction at right angles to the axis of chuck 6: 23, a swingingchuck-carrying arm mounted on this carriage and presenting itself infront of the headstock: 24, a vertical pivot coupling the swinging armto its carriage, the axis of this pivot coinciding with the center ofcurvature to be produced in the tube: 25, a second chuck, herein termedthe swinging chuck, similar in construction to the chuck heretoforedescribed, this swinging chuck being secured to the rear face of theswinging arm with its axis coinciding with that of the other chuck: 26,the hand-wheel for adjusting the spreader of the swinging chuck: 27, alever for shifting the carriage of the swinging arm in its guideway: 28,a link connecting this lever with the carriage: 29, a pin and slotforming a lost motion connection between the link and the carriage sothat the link may have some degree of motion without affecting thecarriage: 30, a swinging latch carried by the bed and adapted, whenengaged, to hold the swinging arm in position with the axis of theswinging chuck in line with the axis of the slidingchuck: 31, a lugcarried by the headstock and adapted, when the headstock is shifted toposition against stopscrew 20, to strike and release latch 30 from theswinging arm: 32, a normally idle hook at the heel of the swinging armat some distance outwardly from the center of its pivot 24: 33, anormally idle hook carried by the link 28 and adapted to latch with hook32 when the swinging arm shall have swung round through an angle ofninety degrees outwardly: 34, a steady-rest in the form of a ring nosepresenting itself within the headstock and rigidly supported by the bedof the machine, the functional or nose part of the bore of thissteadyrest having a diameter equal to that of the outside of the tube tobe dealt with, the axis of this bore coinciding with that of the slidingchuck: 35, a bracket carried fixedly by the bed near its tail end: 36, arod having its tail end supported by this bracket, the .rod extendingaxially through the sliding-chuck, which is capable of sliding upon it,and the front end of the rod extending into the headstock along with thenose of the steadyrest: 37, a disk fast on the inner end of this rod andhaving a diameter suited to the inside of the tube to be dealt with, thefront face of this disk coming substantially even with the face of thenose of the steady-rest: 38, the corrugating tool, in the form of a ringthin at its inner portion and having a bore with a diameter equaling orexceeding that of the outside of the tube to be dealt with, this ringtool being carried by the driving gear of the head-stock, the inner thinportion of the tool coming a very short distance forward of the face ofsteady-rest 34 and disk 37 39, a carrier mounted eccentrieally withindriving ring 11 and carrying corrugating tool 38, which latter isjournaled freely within the carrier: 40, slotted lug and bolt devicesfor securing the tool carrier within driving ring 11 and for providingan adjustment for the degree of eccentricity and angularity of thecarrier relative to the driving ring, the corrugating tool ring beingset at a slight angle to the plane of revolution of the driving-ring:41, a circumferential series of rolls forming a roller bearing where thecorrugating tool-ring 38 is journaled in the tool carrier 39: 42, abevel formed on the front face of disk 37, at the side furthest fromstop-screw 20, this bevel extending about half way round the disk andtapering forwardly to nothing: 43, a longitudinal rack fast with thetailstock: 44, a cross-shaft journaled in the bearing: 45, a gear faston this shaft and engaging the rack; 46, a second cross-shaft: 47, apinion loose on this second cross-shaft and engaging gear 45: 48, a Wormwheel fast on the second cross-shaft: 49, a worm fast on driving shaft13 and engaging the worm-wheel: 50, a clutch to serve in locking pinion47 to the second cross-shaft: 5], a lever fol engaging and disengagingthis clutch: 52, a rod connected with the stop-clutch which is tocontrol the running of the machine: 53, a lever attached to this rod, toserve in throwing the stop-clutch into action when the machine is tostart: 54, a spring connected with this lever and serving, when thelever is free, to so operate upon the stop-clutch as to bring themachine to rest: 55, a trigger mounted on the bed and adapted to be soset as to hold lever 53 in position correspoinling with the activeposition of the stop-clutch and the running condition of the machine:56, a dog carried by the tailstock and adapted, when the tailstock shallhave moved a proper distance toward the headstock, to engage the triggerand release lever 53 and cause spring 54 to act in bringing the machineto rest: 57, an enlargement fast upon the tail end of the driving shalt,gear 15 running loosely upon this enlargement, which enlargement isvirtually a part of the shaft: 53, a rotary pin mounted in theenlargement, parallel with the shaft and at such distance therefrom asto project half of its body transversely into a longitudinalsemicircular groove in the bore of gear 15, about one-half the diameterof the pin being cut away so that. when the pin is turned to oneposition, as seen in Figs. 3, 5) and 10, the gear will be free to turnon the enlargement, while if turned to the position indicated by dottedline in Fig. 10, the pin will serve as a key locking the gear to theenlargement and consequently to the drivingsha l t: 59, a radial armfast on the forward end of the pin: (it), a spring acting on this armand tending to turn the pin to position of action as a driving key: (it,a stop carried by the enlargement to limit the motion of the pin arm toposition corresponding with active position of the pin: 62, a leverpivoted to the frame of the machine and having rod 52 connected with it,the free end of this lever being adapted to swing in front of arm 30 andcause that arm to turn the pin to idle position: (52;, a spring plungercooperating with lever (52 to give the level a lively quick action inswinging from active position: and 64, a stop carried by theenlargenunit to arrest arm 59 with the key-pin in idle position.

Before going into what might be called the retine ments of the action ofthe machine it may be well to dispose of a number of its generalmovements and details.

When the machine is in operation the sliding clntt h (i feeds toward theheadstock at a rate determined by the proportion of the gearing whichoperates it, and in accordance with the pitch of the helix represmitcdby the corrugating. The throwing of clutch 50 into engagement causes theforward feed of the sliding chuck to begin and to proceed at such ratethat each turn of the corrugating tool corresponds with one pitch-unitof advance for the sliding chuck. (hitch 50 is to be disengaged when thetaihstock is to be shift ed rearward, or otherwise moved by hand.

The stop-clutch is without individual novelty, the particularconstruction illustrated representing an ex ample well known in thisclass of devices.

Turning to Fig. 1, spring 54 holds lever (52 in the position shown,under which condition the key-pin is in idle position and gear 15 looserclative to the drivingshaft and the machine at rest. If lever 53 bethrown to the right and there held by trigger 55, lever (52 will se /38oleave the stop-clutch and the key-pin will go to active I at the side ofthe tube nearest stop-screw 20, and the exposition, locking gear 15 tothe driving shaft and starting the eorrugating tool into rotation andthe sliding chuck into advance toward the headstock. When the tail-stockshall have advanced to the point where the corrugating of the tube is tocease, then dog 56 releases the trigger and thereupon spring 54 throwslever 62 into action upon the stop-clutch, whereupon the keypin goes toidle position and the machine comes to rest at a sharply defined pointin the rotation of the corru gating tool, gear 15 proceeding to turnidly relative to the drivingshaft.

Turning to Fig. 3, the swinging arm and the swinging chuck carried by itare in such position that the chuck is in line with the general axis ofthe machine and the arm is there latched by latch 30. If, now, the headstock be shifted a trifle to the left latch 30 will disengage and leavethe swinging arm and swinging clutch free to swing round through anangle of ninety degrees. When the swinging arm completes this degree ofmotion its hook 32 strikes hook 33 and pushes link 28 to the right andtakes up position to be engaged by hook 33. Then, when lever 27 is movedto the left, link hook 33 engages hook 32, before any movement ofcarriage 22 takes place, and then, when the lever is further moved, thecarriage moves to the left and moves the swinging arm and swinging chuckwith it in a direction at right angles to the general axis of themachine.

Looking again at Fig. 3, the headstock is over against stop-screw 19,having been put there by action on lever 21. This is not a workingposition for the headstock but is a temporary position into which theheadstock is to be put when the blank tube is to be inserted in themachine. When the machine is charged and ready for work, then lever 21is turned down, thus forcing the headstock to working position againststop-screw 20. These stops, being in screw form, provide for desirablebut not essential adjustment.

' The two chucks will have functional diameters suited to the size oftube to be dealt with, and so also will the corrugating tool, and thesedevices will be changed as needed.

Now, taking up the action of the corrugating tool, it may be Well tofirst consider it in a hypothetical simplified form. In Fig. 2 thecorrugating tool 38 is a complete ring and is shown in positionconcentric with the chucks and disk and steady-rest. This position ofthe corrugating tool being the non-working or temporary work-insertingposition. After the tube has been inserted then the entire corrugatinghead is moved against stop-screw 20 which will cause the distant edge ofthe bore of the corrugating tool to slightly indent the tube. Assumethis distant edge, instead of being part of a ring, to be simply a thinfinger projecting inwardly its present distance from the driving ring11. Now, with this understanding, it will be apprehended that, after theheadstock isshifted against stop-screw 20, the finger will turn in anorbit eccentric to the axis of the tube. The consequence is that thefinger, making but slight indentation in the metal of the tube at thepoint most distant from stop-screw 20, will work deeper and deeper as itapproaches that stop-screw and then work shallower and shallower as itgoes back to normal position. The finger will thus have produced a trulycircumferential corrugation very much deeper tra metal taken up informing the deeper portion of the corrugation will bring about a bendingof the tube, its longer side being toward stop-screw 19. If, one ofthose corrugations having been produced, the tube be advanced and asecond corrugation be produced, there will be a further curving of thetube, and the ultimate result would be a tube curved after the manner ofordinary corrugated stove pipe elbows.

Still considering the corrugating too] as a 1n ere finger, it will beunderstood that the tube is steadied to the rear of the finger by thenose of the steady-rest outside the tube and by the disk inside thetube, the latter forming an abutment or counter-die so to speak, for theaction of the finger. If the disk were unbeveled, the successivecorrugations at the convex side of the curved tube, would take on aratchet character, not harmful but decidedly unpleasing. By beveling thedisk as at 42, this ratchet form of corrugation is avoided and the twosides of each corrugation may be given symmetrical angles.

Still considering the corrugating tool as a finger, and stillconsidering the corrugations as purely circumferential, the finger wouldbe found to be subject to great wear and generally unsatisiactoryperformance and it would be found particularly liable to rub or tear orcut the metal of the tube, in other words, the assumed finger would beanaggressive rubbing tool to produce the corrugations. But by giving tothe corrugating tool the complete ring form, in lieu of a finger, and bymounting the corrugating ring loosely in its carrier 39, the operationbecomes changed entirely for there need no longer be any rubbing actionand the corrugations may be produced by action of direct pressure. Theroller bearing 41 is introduced to enhance the freedom of thecorrugating ring tool relative to its carrier. 7

In the operation of the machine the corrugating ring may be consideredas entirely non-rotary, its only motion being that of being carried inan eccentric orbit, all portions of the bore of the ring tool acting insuccession upon the tube in producing the corrugationv Thus far purelycircumferential corrugating has been considered, while this machine isdesigned principally for producing helical corrugations by continuous asdistinguished from intermittent action of the machine. Carrier 39 is tobe shifted in the driving ring so that the inner edge of the corrugatingring is at a slight angle to the plane of revolution of thedriving-ring, the degree of the angle being dependent upon the pitchselected for the helix. This angle, as well as the degree ofeccentricity of action, can. be adjusted at the lugs 40.

Thus understanding the general details and general action of the machineit is believed that its entire working for its best results can beeasily followed.

Let the machine be at rest and empty; move the sliding chuck clear tothe left; I shift the headstock against stop-screw l9, bringing the boreof the corru-.

gating ring concentric with the axis of the chuck and steady-rest anddisk; move the carriage of the swing ing arm to the rear, towardstop-screw 19; set the swinging arm so its chuck is in line with thesliding chuck and there latch it by means of latch 30; open both chucks;take the blank tube and open its seam so the blank can be gotten overrod 36 between the headstock and the sliding chuck, let the seam-pointof the blank tube be toward stop-screw 20; pass the tube over disk 37and within the nose of the steady-rest and through the corrugating ringand into the swinging chuck, and clamp the swinging chuck upon it; theprojection oi the right-hand end oi the tube past the corrugatiug ringshould be equal to the distance desired from the end of the tube to thebeginning of the corrugations; move the sliding chuck to the right andclamp it to the iree end of the tube; operate lever 21 and bring theheadstock against stop-screw 20, which will cause the corrugating ringto make a minor indentation in the side ol' the tube away from the seam;the shiiting of the headstock has released latch 30 so that the swingingarm and chuck are free for swinging movement; throw clutch 50 so thatthe feed-work is in condition for action; throw lever 53 and lock it bymeans oi the trigger, thus starting the machine into motion. The actionoi the corrugating ring results in the production of a generallycircumi'erential corrugation, while the eniorced l'orward feeding of thetube, in conjunction with the angular setting oi the corrugating ring,modilies the course of the corrugation into a helix, and if theeorrugating was oi equal depth all around the tube the result would be ahelically corrugated straight tube. As the corrugating proceeds, thecurving oi the tube causes the swinging chuck to move in an are. Whenthe corrugating has proceeded the desired distance then, by the actionof dog 56, the machine automatically comes to rest and the swinging armis in position to have its hook engage the link hook. The swinging chuckis now to be loosened and, upon pulling outward on lever 27, the firsteffect is to latch the swinging arm to the link and the next el'iect isto move the carriage and swinging arm and swinging chuck and pull thelatter off ol' the end of the curved tube which is still in the machine.The sliding chuck is now to be released and the completed curved pipeWithdrawn endwise from the machine.

The exemplifying machine, in producing curved pipes by corrugations inthe term oi a continuous helix permits 01 extremely rapid production andyields an admirable product in which the metal entering into thecorrugations is remarkably l'ree irom destructive action by directcorrugating agent, and the working oi the machine being continuous isfree irom damaging shocks, and the wear and tear on the various parts isreduced to a minimum.

Some of the sub-mechanisms embodied in the ex emplifying machine will beiound useful in other associations in machines of the same general classand it will th ere tore be understood that various changes andinedifications may suggest themselves to the constructive mechanic. Sofar as the present specification is concerned, I have simply set [01ththe principle oi my invention, together with a description oi a machineembodying the best mode in which I at present contemplate employing thatprinciple.

I claim 1. A pipe-curving machine comprising a bed, corrugatingmechanism mounted thereon for carrying an inwardly acting corrugatingtool around a tube in an orbit eccen' tric to the axis 01 the tube, afixed disk to the rear of said tool, a steady-rest nose surrounding thedisk, a sliding chuck adapted to hold the terminal end of the tube andto be advanced toward the corrugating mechanism, a swinging chuck withits axis coinciding with that of the tube, and an arm carrying theswinging chuck and mount' ed for swinging motion on a pivot at rightangles to and at one side ol.- the axis of the sliding chuck, combinedsubstantially as set forth.

ll. A pipe'curving machine comprising a. bed, corrugating mechanismmounted thereon for carrying an inwardly acting corrugaiing tool arounda. tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of. said tool. a. stea1lyrcst nose surrounding the disk, asliding chuck adapted to hold the terminal end of the tube and to beadvanced toward the corrugating mechanism, feeding mechanism for progrtsively and continuously advancing the sliding chuck toward thecorrugating mechanism, a swinging chuck with its axis coinciding withthat of the sliding chuck and adapted to hold the initial end of thetube, and an arm carrying the swinging chuck and mounted for swingingmolion on a. pivot at right angles to and at one side (11' the axis ot'the sliding chuck, combined substantially as set forth.

3, A pipecurving machine comprising a bed, corrugat ing mechanismmounted thereon for carrying an inwardly acting corrugaiing tool arounda tube in an orbit eccentric to the ax" oi the tube, a iixed disk to therear of said tool, a steadyest nose surrounding the disk, a slidingchuck adapted to hold the terminal end oi the tube and to be advancedtoward the corrugating mechanism, feeding mechanism for advancing thesliding chuck toward the cerrugati mechanism, a driving device connectedwith the feeding mechanism, a stop-clutch between the driving device andfeeding mechanism for imparting motion from the former to the latter, a.handcontrolled shitting piece for throwing the stop-clutch into actionso as to connect the feeding mechanism with the driving device, a springacting on the shitting piece and tending to hold the stopclulch incondition disconnecting the driving device from the feed mechanism, atrigger to hold the shifting piece in position corresponding with thecondition of connection between the driving device and feed mechanism, adog moving with the sliding chuck and adapted to release the triggerwhen the sliding chuck has moved a given distance toward the corrugalingmechanism, a swinging chuck with its axis coinciding with that oi thesliding chuck and adapted to hold the initial end ol the tube, and anarm carrying the swinging chuck and mounted for swinging motion on apivot at. right angles to and at one side of the axis of the slidingchuck, combined substantially as set forth.

l. A pipe-curving machine comprising a bed, corru i tric to the axis oi"the tube, a fixed disk to the rear of said tool, asteadyaest nosesurrounding the disk, a. sliding chuck adapted to hold the terminal endoi the tube and to be advanced toward the corrugaiing mechanism, a.swing ing chuck with its axis coincidingwiih that ot the sliding chuckand adapted to hold the initial end of the tube, an arm carrying theswinging chuck and mounted for swinging motion on a pivot at right ang's to and at one side of the axis of the sliding chuck, a driving devicefor trans mitting rotation to the corrugating mechanism, a stopcluichbetween the driving deuce and corrugating mechanism for transmittingmotion lrom the former to the latter, a. lmnd-controlled shitting piecefor putting the stopclutch to active condition in transmitting motion, aspring acting on the shifting piece and tending to put the stopclutch tocondition disconnecting the power device from the corrugating mechanism,a trigger to hold the shifting piece in adyusted position against theresistance 011 the spring, and a dog moving with the sliding chuck andadapted to release the trigger when the sliding chuck shall have moved agiven distance toward the corrugatiug mechanism, combined substantiallyas set iforth.

5. A pipecurving machine comprising a bed, corrugating mechanism mountedthereon for carrying an inwardly acting corrugating tool around a tubein an orbit eccentric to the axis oi the tube, a Iixed disk to the rearof. said tool, a steadyrest nose surrounding the disk, a sliding chuckadapted to hold the terminal end oi. the tube and to be advanced towardthe corrugating mechanism, a swingsliding chuck and adapted to hold theinitial end of the ing chuck with its axis coinciding with that oi thesliding chuck and adapted to hold the initial end of the tube, an armcarrying the swinging chuck and mounted for swinging motion on a pivotat right angles to and at one side of the axis of the sliding chuck, acarriage supporting said arm and adapted for movement in a direction atright angles to the axis of the sliding chuck, and hand mechanism forshifting said carriage, combined substantially as set forth.

6. A pipe-curving machine comprising a bed, corrugating mechanismmounted thereon for carrying; an inwardly acting corrugating tool arounda tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of said tool, a steady-rest nose surrounding the disk, asliding chuck adapted to hold the terminal end of the tube and to beadvanced toward the corrugating mechanism, a swinging chuck with itsaxis coinciding with that of the sliding chuck and adapted to hold theinitial end of the tube, an arm carrying the swinging chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the sliding chuck, a carriage supporting said arm and adaptedfor movement in a direction at right angles to the axis of the slidingchuck, hand mechanism for shifting said carriage, and a latch engagingsaidarm and adapted to temporarily hold the arm in such position thatthe swinging chuck is in line with the sliding chuck, combinedsubstantially as set forth.

7. A pipe-curving machine comprising a bed, corrugating mechanismmounted thereon for carrying an in wardly acting corrugating tool arounda tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of said tool, a steady-rest nose surrounding the disk, asliding chuck adapted to hold the terminal end of the tube and to beadvanced toward the corrugating mechanism, a swinging chuck with itsaxis coinciding with that of the sliding chuck and adapted to hold theinitial end of the tube, an arm carrying the swinging chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the sliding chuck, a carriage supporting said arm and adaptedfor movement in a direction at right angles to the axis of the slidingchuck, hand mechanism for shifting said carriage, a latch engaging saidarm and adapted to temporarily hold the arm in such position that theswinging chuck is in line with the sliding chuck, a shifting device formoving the corrugating mechanism transversely of the axis of the slidingchuck, and a projection shifting with the corrugating mechanism andadapted to engage and release said latch when the corrugating mechanismis moved into working position, combined substantially as set forth.

8. A pipe-curving machine comprising a bed, corrugating mechanismmounted thereon for carrying an inwardly acting corrugating tool arounda tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of said tool, a steady-rest nose surrounding the disk, asliding chuck adapted to hold the terminal end of the tube and to beadvanced toward the corrugating mechanism, a swinging chuck with itsaxis coinciding with that of the sliding chuck and adapted to hold .theinitial end of the tube, an arm carrying the swinging chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the sliding chuck, a carriage supporting said arm and adaptedfor movement at right angles to the axis of the sliding chuck, handmechanism for shifting said carriage, and a latching device adapted tohold the arm in position with the axis of the swingtube and to beadvanced toward the corrugating mechanism, a swinging chuck with itsaxis coinciding with that of the sliding chuck and adapted to hold theinitial end of the tube, an arm carrying the swinging chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the sliding chuck, a carriage supporting the arm and adapted formovement to and from the axis of the sliding chuck, a hand lever forshifting the carriage, a link connecting said lever with the carriageand adapted for a limited degree of motion independent of the carriage,a latch-part carried by the link, and a latch-part carried by the armand adapted to engage with the latch-part on the link when the arm hasmoved the swinging chuck to position with its axis at right angles tothe axis of the sliding chuck, combined substantially as set forth.

10. A pipe-curving machine comprising a bed, transversely adjustablecorrugating mechanism mounted thereon for carrying an inwardly actingcorrugating tool around a tube in an orbit eccentric to the axis of thetube, a fixed disk to the rear of said tool, a steady-rest nosesurrounding the disk, a sliding chuck adapted to hold the terminal endof the tube and to be advanced toward the corrugating mechanism, aswinging chuck with its axis coinciding with that of the sliding chuckand adapted to hold the initial end of the tube, an arm carrying theswinging chuck and mounted for swinging motion on a pivot at rightangles to and at one side of the axis of the sliding chuck, stops tolimit the transverse adjustment of, the corrugating mechanism, and ahand operative device for shifting the corrugating mechanism to and fromsaid stops and locking it against one of said stops, combinedsubstantially as set forth.

11. A pipe-curving machine comprising a bed, corrugating mechanismmounted thereon for carrying an inwardly acting corrugating tool arounda tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of said tool, a steady-rest nose surrounding the disk, asliding chuck adapted to hold the terminal end of the tube and to beadvanced toward the corrugating mechanism, a swinging chuck with itsaxis coinciding with that of the sliding chuck and adapted to hold theinitial end of the tube, an arm carrying the swinging chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the sliding chuck, a driving device, transmitting mechanismconnecting the driving device and corrugating mechanism, transmittingmechanism connecting the driving device and sliding chuck forautomatically advancing the latter, and a hand-operative clutchinterposed in the transmitting mechanism between the power device andsliding chuck to permit the sliding chuck to be released from the powerdevice and be moved to and from the corrugating mechanismby hand,combined substantially as set forth.

12. A pipe curving machine comprising a bed, corrugating mechanismmounted thereon for carrying an in wardly acting corrugating tool aroundthe tube in an orbit eccentric to the axis of the tube, a fixed disk tothe rear of said tool, a steady-rest nose surrounding the disk, a chuckring disposed with its axis parallel with the axis of the corrugatingmechanism and adapted to fit the exterior of the terminal end of thetube, an expansihle plug disposed within the ring and adapted to clampthe tube therein, a conical spreader disposed within the plug, a handlefor drawing the spreader endwise and expanding the plug, said ring,plug, spreader and handle constituting a chuck for the terminal end ofthe tube, a carrier supporting said chuck and adapted to advance thechuck toward the corrugating mechanism, an arm mounted for swingingmotion on a pivot at right angles of the axis of said sliding chuck, anda chuck similar to said sliding chuck but supported on said arm,combined substantially as set forth.

13. A pipe-curving machine comprising a bed, corrugat ing mechanismmounted thereon for carrying an inwardly acting corrugating tool arounda tube in an orbit eccentric to the axis of the tube, a disk fixedlysupported to the rear of said tool and having its face toward the toolbeveled throughout a portion of its periphery, a steady-rest nosesurrounding the disk, a sliding chuck adapted to hold the terminal endof the tube and to be advanced toward the corrugating mechanism, aswinging chuck with its axis coinciding with that of the sliding chuckand adapted to hold the initial end of the tube, and an arm carrying theswinging chuck and mounted for swinging motion on a pivot at rightangles to and at one side of the axis of the sliding chuck, combinedsubstantially as set forth.

14. A pipecurving machine comprising a bed, a chuck to hold the terminalend of a tube and adapted for sliding motion axially of the tube, asecond chuck to hold the initial end of the tube in line with thefirst-mentioned chuck, an arm carrying the second chuck and mounted forswinging motion on a pivot at right angles to and at one side of theaxis of the first-mentioned chuck, a disk fixedly supported between thetwo chucks concentric with the axis of the firstmentioned chuck, asteady-rest nose surrounding the disk, a bearing disposed between thetwo chucks and with its axis eccentric to the axis of the disk, adriving-ring mounted for rotation in said bearing, and a corrugatingtool carried by said driving ring and presenting a thin inwardly-actingedge in advance of the steady-rest nose, combined substantially as setforth.

15. A.pipe-curving machine comprising a bed, a chuck to hold theterminal of a tube and adapted for sliding motion axially of the tube, asecond chuck to hold the initial end of the tube in line with thefirstn1entioned chuck, an arm carrying the second chuck and mounted forswinging motion on a pivot at right angles to and at one side of theaxis of the first-mentioned chuck, a disk fixedly supported between thetwo chucks concentric with the axis of the first mentioned chuck, asteady-rest nose surrounding the disk, a bearing disposed between thetwo chucks and with its axis eccentric to the axis of the disk, adriving-ring mounted for rotation in said bearing, a carrier within saiddriving-ring, means for adjusting the position of the carrier in thedriving-ring, and a corrugating tool carried by said carrier andpresenting a thin inwardly-acting edge in advance of the steady-restnose, combined substantially as set forth.

16. A pipe-curving machine comprising a bed, a chuck to hold theterminal end of a tube and adapted for sliding motion axially of thetube, a second chuck to hold the initial end of the tube in line withthe first-mentioned chuck, an arm carrying the second chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the first-mentioned chuck, a disk fixedly supported between thetwo chucks concentric with the axis of the first-mentioned chuck, asteady-rest nose surrounding the disk, a bearing disposed between thetwo chucks and with its axis eccentric to the axis of the disk, adrivinga-ing mounted for rotation in said bearing, a carrier securedwithin the driving-ring and formed with a bearing eccentric to the axisof the drivinga'ing, a ring tool disposed within said last-mentionedbearing and presenting a thin inner edge in advance of the steady-restnose, and means for adjusting the eccentricity and angularity of saidthin inner edge relative to the driving-ring, combined substantially asset forth.

17. A pipe-curving machine comprising a bed, a chuck to hold theterminal end of a tube and adapted for sliding motion axially of thetube, a second chuck to hold the initial end of the tube in line withthe lirst-mentioncil chuck, an arm carrying the second chuck and mountedfor swinging motion on a pivot at right angles to and at one side of theaxis of the first-mentioned chuck, a disk fixedly supported between thetwo chucks concentric with the axis of the first-mentioned chuck, asteadya-est nose surrounding. the disk, a bearing disposed between thetwo chucks and with its axis eccentric to the axis of the disk, adriving-ring mounted for rotation in said bearing, a car rier securedwithin the drivinga'ing and formed with a bearing eccentric to the axisof the drivingaing. ringtool disposed within said iast1ne11tionedbearing presenting a thin inner edge in advance of the rest nose, anannular series of rolls between the rin, and its bearing, and means foradjusting the eccentricity and angularity of said thin inner edgerelative to the driving-ring, combined substantially as set forth.

18. A pipe-curving machine comprising a bed, a chuck to hold theterminal end of a. tube and adapted for sliding motion axially of thetube, a second chuck to hold the initial end of the tube in line withthe lirst-nienlionod chuck, an arm carrying the second chuck and mountedfor swinging motion on a pivot at right angles to and at one side 01 theaxis 01' the lirstanentioned chuck, a disk lixcdly supported between thetwo chucks concentric with the axis of the first-mentioned chuck, astead vrest nose surrounding the disk, a bearing disposed between thetwo chucks and with its axis ecceulric to the axis of the disk andmounted for adjustment transversely ol' the axis oi the tube, adriving-ring mounted for rotation in said hearing, a ring-tool mountedeccenlrically within the drivingring and presenting a thin inner edge inadvance of. the steady-rest nose, means for shifting said bearing transversely of the tube, stops to limit the transverse shitting movement ofsaid bearing, and a locking device to hold said bearing in shiftedposition against one of said stops, combined substantially as set forth.

1!). A pipe curving machine comprising a device for clamping andadvancing the terminal end of the tube. a device for clamping theinitial end of the lube and sup porting it in movement through a curvedpath as the tube is bent, a disk to inleriorly support an intermediateportion of the tube, a steady-rest nose surrounding the disk, a ringtoolsurrounding the tube in advance of the steady-rest nose. mechanism forsupporting the ring-tool and carrying it in a circular orbit eccentr cto the axis of the disk, and mechanism for progressively andcontinuously advancing the clamping device at the terminal end of thetube, combined substantially as set iforth.

WILLIAM CLARK KIRK.

Witnesses:

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